1912.] NATURAL SCIENCES OF PHILADELPHIA. 153 



faint traces of crenulation on the basal margin. The anterior adduc- 

 tor scar is raised in the cast and the posterior slightly sunken. 



Length 105, alt. (as broken) 88 mm. 



C. curta Conrad and C. conradi Whitfield, though very much 

 smaller, are similar to this species in contour, but both seem to be 

 smoother externally. C. littoralis Conrad is a similarly sculptured 

 species, but it is more inequilateral and far smaller so far as known. 

 C. vadosa Morton has the outline of C. willcoxi, except by its greater 

 compression. Most of the American Tertiary Crassatellites are longer 

 and more produced posteriorly than C. willcoxi. 

 Vasum wilmingtonense n. sp. PI. I, figs. 2. 3. 



This form is represented by an internal cast wanting the apical 

 whorls, apparently derived from a species shaped like V. haitense. 

 The conic spire diverges at an angle of about 80°, the crown of each 

 whorl being narrowly rounded. The last whorl is much less convex 

 above, being somewhat flattened and sloping to the rounded shoulder. 

 The periphery, viewed from above, is polygonal; the last three 

 angles on the last half whorl are prominent, but several on the first 

 half are barely perceptible. Below the shoulder the sides taper 

 to the narrow base, are a little swollen midway and contracted below 

 the shoulder and near the base. Four deep furrows indicate as many 

 stout columellar folds in the shell, the lowest one being somewhat 

 smaller. The length of the cast is 113 mm. and the greatest diameter 

 66 mm. 



In the absence of information as to the stratigraphic position of 

 the specimens, we cannot say whether this species occurred with 

 the preceding Eocene forms or, as seems more likely, in an overlying 

 bed. 



Correction. — The Editor regrets that, through an inadvertence, 

 the name of Charles Morris was substituted for that of Effingham 

 B. Morris on the Finance Committee (page 1). 



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